When you cast this spell, choose one of cold, fire, electricity, or acid. You bring forth a barrier that absorbs a total of the first 8 damage/caster level (maximum 120 damage) of that type. This spell also gains that keyword. The target of that spell can use any energy absorbed in a few ways.

He can expend any amount of energy as part of casting an evocation to add 1/4th the energy expended in that damage type as part of the spell.

Can expend 7 energy as a swift action to be treated as armed for 1 round. His unarmed attack or melee weapon is treated as a weapon one size larger and gains a further 1d6 damage. All damage that that weapon inflicts
is of that element.

Can expend 30 damage as a standard action to not exist to a spell of that subtype for 1 round. You cannot be targeted by such a spell, nor are you affected by such a spell if you are within it’s area of effect, as if you weren’t even on the plane.

Expending energy does not restore the capacity of this ward, once the ward absorbs it’s maximum amount, it cannot prevent any more damage, although you can still expend energy.

One can only have one Elemental Siphon active on him at a time. If cast on a target with Protection from Energy, and this ward is the same element, 1/2 of the remaining capacity from Protection from Energy is added to this spell and Protection from Energy is immediately ended. This extra capacity does not count towards the 120 damage limit.

When you cast this spell, choose one of cold, fire, electricity, or acid. This spell also gains that keyword. You bring forth a ward that absorbs 100 plus 5 damage per caster level (no limit) damage of that type. The target of that spell can use any energy absorbed in a few ways.

You can use any of the effects of Elemental Siphon, as well as the following effects:

You can place a persistent aura around you as a free action on your own turn. For each 4 energy drained, you can choose to either do 1 damage of the warded element to every creature within 15 feet of you (no save) or negate 1 damage of the warded element to every creature within 15 feet of you. Unless you stop this aura as a free action on your own turn, it drains energy every round.

You can expend 50 energy as a swift action to do 1d6 damage per 2 caster levels of that energy’s damage within a 30 ft cone (Reflex negates).

You can expend 80 energy as part of casting an evocation spell of the same element as the ward to have that spell completely ignore elemental resistance (but not immunity).

You can expend 120 energy as a full-round action to summon Elementals as per Summon Monster VI. The elemental must match the type of the ward, and has a duration of 1 round per caster level.

The remaining capacity of this ward is how much energy the ward can absorb, thus spending energy increases the strength of the ward. If this ward attempts to absorb more than the maximum amount of energy, the ward immediately shatters and inflicts all of the stored damage onto the wearer (Fortitude half).

One can only have one Elemental Siphon or Reckless Elemental Siphon active on him at a time. If Protection from Energy and this spell are on the same subject, the newer spell is the first spell to take effect if the target is hit with a source of elemental damage.